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  • 1
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    In:  CASI
    Publication Date: 2010-01-11
    Description: Image intensifiers for solar photometry
    Keywords: NAVIGATION
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  • 2
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    In:  CASI
    Publication Date: 2005-11-27
    Description: Applying observing concepts and data handling techniques of ground-based astronomy to design of instruments for space stations
    Keywords: INSTRUMENTATION AND PHOTOGRAPHY
    Type: NASA, WASHINGTON OPT. TELESCOPE TECHNOL. 1970; P 657-659
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  • 3
    Publication Date: 2006-02-14
    Description: The Jet Propulsion Laboratory 25-foot space simulator with its 5.8-m (19-ft) diameter simulated solar beam provides an excellent facility for measuring the optical characteristics of parabolic solar concentrator panels and gores. The virtual source position and size were determined by using a single lamp of the 37 xenon 30-kW source array with only the center lens in the 19-channel optical mixer. This data was used to define the optical test geometry, and it allowed accurate measurement of focal length and surface deviations of the mirror under test. A flux distribution of a typical solar concentrator placed directly on the solar beam gives measurements of performance at the focal point of the parabolic surface.
    Keywords: SPACECRAFT DESIGN, TESTING AND PERFORMANCE
    Type: NASA. Goddard Space Flight Center 12th Space Simulation Conf.; 19 p
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  • 4
    Publication Date: 2011-08-19
    Description: The architecture, capabilities, and testing of the Advanced Star and Target Reference Optical Sensor (ASTROS) I and II are described. The ASTROS I tracker is to be utilized for a UV telescope experiment on a Shuttle flight and is capable of measuring pointing errors of 1.5 microrad, and the ASTROS II tracker is being developed for the Mariner Mark II spacecraft to perform tracking, guiding, and optical navigation functions. The requirements for the two trackers are compared. Consideration is given to star and target tracking, optical navigation, and mass and power constraints. The compositions of the trackers, in particular the sensor, electrode drives, amplifiers and signal clamp, video signal processor, control and timing generator, memories, microprocessor, and interface, are examined.
    Keywords: SPACECRAFT INSTRUMENTATION
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  • 5
    Publication Date: 2011-08-19
    Description: The design and application of ASTROS (Advanced Star and Target Reference Optical Sensor) are described, with emphasis on performance test results acquired with a prototype system. The ASTROS tracker provides extremely precise measurements of star image coordinates as inputs to the Image Motion Compensation (IMC) system used to stabilize the science instrument focal planes. Performance levels achieved are dramatic improvements over the levels achieved with image dissector designs with comparable fields of view.
    Keywords: SPACECRAFT INSTRUMENTATION
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  • 6
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    In:  CASI
    Publication Date: 2016-06-07
    Description: To insure that the insolation values accurately represent the input power to a power conversion unit the field of view (FOV) of the concentrator aperture and the insolation radiometer must be the same. The calculations, implementation, and results of this approach are covered. Three instruments were used to measure the insolation: an Eppley Normal Incidence Radiometer (NIP) and two versions of the kendall cavity radiometer. The shrouds used to limit the FOV of the radiometers were designed to simulate the FOV of the PDC-1 concentrater with the cold water cavity calorimeter. This technique of matching the FOV of an insolation radiometer to the FOV of a specific concentrater and receiver aperture appears to be both practical and effective. The efficiency of a power conversion unit will be too low if the insolation is measured with a radiometer which has a FOV which is larger than the FOV of the concentrator.
    Keywords: INSTRUMENTATION AND PHOTOGRAPHY
    Type: JPL Proc. of the 5th Parabolic Dish Solar Thermal Power Program; p 215-225
    Format: application/pdf
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  • 7
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    In:  CASI
    Publication Date: 2016-06-07
    Description: The design, construction, and installation of the Parabolic Dish Concentrator, Type 1 (PDC-1) has been one of the most significant JPL concentrator projects because of the knowledge gained about this type of concentrator and the development of design, testing, and analysis procedures which are applicable to all solar concentrator projects. The need for these procedures was more clearly understood during the testing period which started with the prototype panel evaluation and ended with the performance characterization of the completed concentrator. For each phase of the test program, practical test procedures were required and these procedures defined the mathematical analysis which was essential for successful concentrator development. The concentrator performance appears to be limited only by the distortions resulting from thermal gradients through the reflecting panels. Simple optical testing can be extremely effective, but comprehensive mechanical and optical analysis is essential for cost effective solar concentrator development.
    Keywords: ENERGY PRODUCTION AND CONVERSION
    Type: Proc. of the 5th Parabolic Dish Solar Thermal Power Program; p 15
    Format: application/pdf
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  • 8
    Publication Date: 2018-06-08
    Description: The Cassini spacecraft will perform a detailed examination of the Saturnian system, including the release of a probe to study Saturn's largest satellite, Titan. The star tracker for the Cassini mission must provide accurate data during the entire flight including four years of measurement in a harsh radiation environment.
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  • 9
    Publication Date: 2019-06-28
    Description: A LaJet Energy Company (LEC) concentrator facet, 60 in. in diameter, was tested for imaging quality. The following two methods were used: (1) autofocus tests with a point source of light at the facet's radius of curvature; and (2) tests with the Sun close to the horizon as a distant source. The tests of the LaJet facet indicate that all of the solar image reflected by an LEC 460 solar concentrator made of like facets should fall within a 9-in. aperture if the outer facets are carefully adjusted. Such a concentrator would have acceptable performance, but complete evaluation must be made with an assembled concentrator.
    Keywords: ENERGY PRODUCTION AND CONVERSION
    Type: NASA-CR-173470 , JPL-PUB-83-92 , JPL-5105-125 , DOE/JPL-1060-64 , NAS 1.26:173470
    Format: application/pdf
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  • 10
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    In:  Other Sources
    Publication Date: 2019-06-28
    Description: Tracking accuracy and resolution of charge-coupled device (CCD) imaging arrays measured by instrument originally developed for measuring performance of star-tracking telescope. Operates by projecting one or more artifical star images on surface of CCD array, moving stars in controlled patterns, and comparing star locations computed from CCD outputs with those calculated from step coordinates of micropositioner.
    Keywords: ELECTRONIC SYSTEMS
    Type: NPO-15665 , NASA Tech Briefs (ISSN 0145-319X); 8; 4; P. 470
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